Do i have to use full synthetic oil

The differences mostly come down to the oil refining process. Conventional oil, while cheaper than synthetic, is less refined and can lead to more engine sludge and gunk build-up down the road.

Synthetic oils typically provide better protection than conventional oils, but switching back and forth between full synthetic and conventional oil will not damage the engine. Of course, this depends on the current engine condition and the quality of the conventional oil being used.

No Engine Cleanliness And Protection As regular oil moves through the vehicle's engine, it degrades slowly thus leaving harmful deposits and even leading to the formation of sludge. It can affect the performance of your car's engine and the life of the vehicle.